Influence of weak magnetic fields on the extraordinary refractive index of two cyanoalkylbiphenyls
Changes in the extraordinary refractive indices of 4-cyano-4'-n-pentylbiphenyl (5CB) and 4-cyano-4'-n-heptylbiphenyl (7CB) were measured, in their liquid crystalline mesophase, as a function of temperature, (T) and weak constant magnetic field (B) (0-600 gauss). The field was applied paral...
Guardado en:
| Autor principal: | |
|---|---|
| Publicado: |
1994
|
| Materias: | |
| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01677322_v62_n1-3_p181_Radice http://hdl.handle.net/20.500.12110/paper_01677322_v62_n1-3_p181_Radice |
| Aporte de: |
| id |
paper:paper_01677322_v62_n1-3_p181_Radice |
|---|---|
| record_format |
dspace |
| spelling |
paper:paper_01677322_v62_n1-3_p181_Radice2023-06-08T15:16:55Z Influence of weak magnetic fields on the extraordinary refractive index of two cyanoalkylbiphenyls Barón, Máximo Deformation Liquid crystals Magnetic field effects Molecular orientation Optical variables measurement Prisms Refractive index Thermal effects 4 cyano 4 n heptylbiphenyl 4 cyano 4 n pentylbiphenyl Chatelain prism Aromatic hydrocarbons Changes in the extraordinary refractive indices of 4-cyano-4'-n-pentylbiphenyl (5CB) and 4-cyano-4'-n-heptylbiphenyl (7CB) were measured, in their liquid crystalline mesophase, as a function of temperature, (T) and weak constant magnetic field (B) (0-600 gauss). The field was applied parallel to the optical axis of the sample. Chatelain's prism was used as measuring cell, for a total of 500 measurements. The slopes of the extraordinary (ne) and the ordinary (no) refractive indices were examined as a function of temperature and magnetic field (T and B). As expected from previous work (1, 2), ne vs T was found to be negative. Consequently, there also seems to be a competition between the disorder created by temperature (internal movements, deformation and molecular rotations) and the orientational effect of the rubbed glass plates of the measuring cell, reinforced by the parallel magnetic field. On the other hand the slope ne(T) vs B (Figure) shows an anomalous behaviour in the low field region (100-400 gauss), with no explanation available yet. © 1994. Fil:Barón, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 1994 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01677322_v62_n1-3_p181_Radice http://hdl.handle.net/20.500.12110/paper_01677322_v62_n1-3_p181_Radice |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Deformation Liquid crystals Magnetic field effects Molecular orientation Optical variables measurement Prisms Refractive index Thermal effects 4 cyano 4 n heptylbiphenyl 4 cyano 4 n pentylbiphenyl Chatelain prism Aromatic hydrocarbons |
| spellingShingle |
Deformation Liquid crystals Magnetic field effects Molecular orientation Optical variables measurement Prisms Refractive index Thermal effects 4 cyano 4 n heptylbiphenyl 4 cyano 4 n pentylbiphenyl Chatelain prism Aromatic hydrocarbons Barón, Máximo Influence of weak magnetic fields on the extraordinary refractive index of two cyanoalkylbiphenyls |
| topic_facet |
Deformation Liquid crystals Magnetic field effects Molecular orientation Optical variables measurement Prisms Refractive index Thermal effects 4 cyano 4 n heptylbiphenyl 4 cyano 4 n pentylbiphenyl Chatelain prism Aromatic hydrocarbons |
| description |
Changes in the extraordinary refractive indices of 4-cyano-4'-n-pentylbiphenyl (5CB) and 4-cyano-4'-n-heptylbiphenyl (7CB) were measured, in their liquid crystalline mesophase, as a function of temperature, (T) and weak constant magnetic field (B) (0-600 gauss). The field was applied parallel to the optical axis of the sample. Chatelain's prism was used as measuring cell, for a total of 500 measurements. The slopes of the extraordinary (ne) and the ordinary (no) refractive indices were examined as a function of temperature and magnetic field (T and B). As expected from previous work (1, 2), ne vs T was found to be negative. Consequently, there also seems to be a competition between the disorder created by temperature (internal movements, deformation and molecular rotations) and the orientational effect of the rubbed glass plates of the measuring cell, reinforced by the parallel magnetic field. On the other hand the slope ne(T) vs B (Figure) shows an anomalous behaviour in the low field region (100-400 gauss), with no explanation available yet. © 1994. |
| author |
Barón, Máximo |
| author_facet |
Barón, Máximo |
| author_sort |
Barón, Máximo |
| title |
Influence of weak magnetic fields on the extraordinary refractive index of two cyanoalkylbiphenyls |
| title_short |
Influence of weak magnetic fields on the extraordinary refractive index of two cyanoalkylbiphenyls |
| title_full |
Influence of weak magnetic fields on the extraordinary refractive index of two cyanoalkylbiphenyls |
| title_fullStr |
Influence of weak magnetic fields on the extraordinary refractive index of two cyanoalkylbiphenyls |
| title_full_unstemmed |
Influence of weak magnetic fields on the extraordinary refractive index of two cyanoalkylbiphenyls |
| title_sort |
influence of weak magnetic fields on the extraordinary refractive index of two cyanoalkylbiphenyls |
| publishDate |
1994 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01677322_v62_n1-3_p181_Radice http://hdl.handle.net/20.500.12110/paper_01677322_v62_n1-3_p181_Radice |
| work_keys_str_mv |
AT baronmaximo influenceofweakmagneticfieldsontheextraordinaryrefractiveindexoftwocyanoalkylbiphenyls |
| _version_ |
1768543940932272128 |